Pirin is a human gene encoded by the symbol, PIR. It may also be known as: Probable quercetin 2,3-dioxygenase PIR; Probable quercetinase; Pirin ; pirin (iron-binding nuclear protein). The encoded protein is an enzyme with an amino acid length of 290 and a mass of 32.1 kDa. Pirin is a member of the Pirin family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Arabidopsis, Zebrafish, Frog.